Update plugin org.jetbrains.intellij.platform to v2.9.0

Author: renovate[bot]

gradle.properties

@@ -8,7 +8,7 @@ pluginVersion=252.1.0
 
 rdVersion=2025.1.1
 rdKotlinVersion=2.1.0
-intellijPlatformGradleVersion=2.6.0
+intellijPlatformGradleVersion=2.9.0
 gradleJvmWrapperVersion=0.15.0
 
 buildConfiguration=Debug